Error(s) in re-building vignettes:
--- re-building 'SW00_Introduction_to_sweep.Rmd' using rmarkdown
Loading required package: lubridate

Attaching package: 'lubridate'

The following object is masked from 'package:base':

    date

Loading required package: PerformanceAnalytics
Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric


Attaching package: 'PerformanceAnalytics'

The following object is masked from 'package:graphics':

    legend

Loading required package: quantmod
Loading required package: TTR
Version 0.4-0 included new data defaults. See ?getSymbols.
Loading required package: tidyverse
-- Attaching packages ---------------------------------- tidyverse 1.2.1 --
v ggplot2 3.2.1     v purrr   0.3.2
v tibble  2.1.3     v dplyr   0.8.3
v tidyr   0.8.3     v stringr 1.4.0
v readr   1.3.1     v forcats 0.4.0
-- Conflicts ------------------------------------- tidyverse_conflicts() --
x lubridate::as.difftime() masks base::as.difftime()
x lubridate::date()        masks base::date()
x dplyr::filter()          masks stats::filter()
x dplyr::first()           masks xts::first()
x lubridate::intersect()   masks base::intersect()
x dplyr::lag()             masks stats::lag()
x dplyr::last()            masks xts::last()
x lubridate::setdiff()     masks base::setdiff()
x lubridate::union()       masks base::union()
--- finished re-building 'SW00_Introduction_to_sweep.Rmd'

--- re-building 'SW01_Forecasting_Time_Series_Groups.Rmd' using rmarkdown
Loading required package: lubridate

Attaching package: 'lubridate'

The following object is masked from 'package:base':

    date

Loading required package: PerformanceAnalytics
Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric


Attaching package: 'PerformanceAnalytics'

The following object is masked from 'package:graphics':

    legend

Loading required package: quantmod
Loading required package: TTR
Version 0.4-0 included new data defaults. See ?getSymbols.
Loading required package: tidyverse
-- Attaching packages ---------------------------------- tidyverse 1.2.1 --
v ggplot2 3.2.1     v purrr   0.3.2
v tibble  2.1.3     v dplyr   0.8.3
v tidyr   0.8.3     v stringr 1.4.0
v readr   1.3.1     v forcats 0.4.0
-- Conflicts ------------------------------------- tidyverse_conflicts() --
x lubridate::as.difftime() masks base::as.difftime()
x lubridate::date()        masks base::date()
x dplyr::filter()          masks stats::filter()
x dplyr::first()           masks xts::first()
x lubridate::intersect()   masks base::intersect()
x dplyr::lag()             masks stats::lag()
x dplyr::last()            masks xts::last()
x lubridate::setdiff()     masks base::setdiff()
x lubridate::union()       masks base::union()
--- finished re-building 'SW01_Forecasting_Time_Series_Groups.Rmd'

--- re-building 'SW02_Forecasting_Multiple_Models.Rmd' using rmarkdown
Loading required package: lubridate

Attaching package: 'lubridate'

The following object is masked from 'package:base':

    date

Loading required package: PerformanceAnalytics
Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric


Attaching package: 'PerformanceAnalytics'

The following object is masked from 'package:graphics':

    legend

Loading required package: quantmod
Loading required package: TTR
Version 0.4-0 included new data defaults. See ?getSymbols.
Loading required package: tidyverse
-- Attaching packages ---------------------------------- tidyverse 1.2.1 --
v ggplot2 3.2.1     v purrr   0.3.2
v tibble  2.1.3     v dplyr   0.8.3
v tidyr   0.8.3     v stringr 1.4.0
v readr   1.3.1     v forcats 0.4.0
-- Conflicts ------------------------------------- tidyverse_conflicts() --
x lubridate::as.difftime() masks base::as.difftime()
x lubridate::date()        masks base::date()
x dplyr::filter()          masks stats::filter()
x dplyr::first()           masks xts::first()
x lubridate::intersect()   masks base::intersect()
x dplyr::lag()             masks stats::lag()
x dplyr::last()            masks xts::last()
x lubridate::setdiff()     masks base::setdiff()
x lubridate::union()       masks base::union()
Quitting from lines 65-66 (SW02_Forecasting_Multiple_Models.Rmd) 
Error: processing vignette 'SW02_Forecasting_Multiple_Models.Rmd' failed with diagnostics:
$ operator is invalid for atomic vectors
--- failed re-building 'SW02_Forecasting_Multiple_Models.Rmd'

SUMMARY: processing the following file failed:
  'SW02_Forecasting_Multiple_Models.Rmd'

Error: Vignette re-building failed.
Execution halted